Compositions containing n-ethyl hydroxamic acid chelants
AssigneeMonsanto Company
InventorBruce F. Monzyk
Life of this patent
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Abstract
N-ethyl hydroxamic acids, preferably containing at least 10 carbon atoms, useful as metal chelants for use in organic solvent extractant solutions such as kerosene to extract metals from aqueous solutions by forming complexes of the extracted metal with the N-ethyl hydroxamic acid. Metals can be stripped from complexes of N-ethyl hydroxamic acids at higher concentrations into lower strength acid stripping agents. The N-ethyl hydroxamic acid-containing organic solvent extraction solutions exhibit rapid phase separation from aqueous solutions and resistance to forming emulsions.
Claims1
A metal extractant solution comprising an organic solvent and an N-ethyl hydroxamic acid selected from the group consisting of N-ethyl n-octanohydroxamic acid, N-ethyl 2-ethylhexanohydroxamic acid, N-ethyl nonanohydroxamic acid, N-ethyl n-decanohydroxamic acid, N-ethyl neodecanohydroxamic acid, N-ethyl tridecanohydroxamic acid, N-ethyl 2-hexyldecanohydroxamic acid and N-ethyl isostearohydroxamic acid.
Dependencies are inferred from the claim text.